Transfer PDF from OS X to iPad

I download pdf files on my Mac, and often transfer them to iPad to read.

This used to be straightforward, but the process seems to be much more complex.

I need to select the pdf, select "Open in iBooks" (which actually displays in Preview) then go through the process on iTunes to transfer it to iPad.

Is there a simpler way. I don't actually want to read in iBooks on the Mac (which doesn't happen anyway)?

All I really want to do is transfer selected pdf to iPad.